Intrathecal sufentanil versus epidural lidocaine with epinephrine and sufentanil for early labor analgesia.
Dunn SM, Connelly NR, Steinberg RB, Lewis TJ, Bazzell CM, Klatt JL, Parker RK. Intrathecal sufentanil versus epidural lidocaine with epinephrine and sufentanil for early labor analgesia. Anesth Analg. 1998 Aug; 87(2):331-5.